Pulse calibration workflow¶

This notebook calibrates the default half-pi / pi pulses first, then shows how to refine the DRAG versions. The goal is to leave you with inspectable cached pulses and quick validation plots.

1. Create an Experiment¶

Select one qubit and load the configuration that contains its current pulse parameters.

In [ ]:

import numpy as np

import qubex as qx

exp = qx.Experiment(
    system_id="YOUR_SYSTEM_ID",
    muxes=[0],
    # config_dir="/path/to/qubex-config/config",
    # params_dir="/path/to/qubex-config/params/YOUR_SYSTEM_ID",
)

import numpy as np import qubex as qx exp = qx.Experiment( system_id="YOUR_SYSTEM_ID", muxes=[0], # config_dir="/path/to/qubex-config/config", # params_dir="/path/to/qubex-config/params/YOUR_SYSTEM_ID", )

2. Connect to the setup¶

Connect before you run any checks or pulse calibrations.

In [ ]:

exp.connect()

exp.connect()

3. Check the waveform¶

Start with a waveform check so you can catch obvious readout issues before tuning pulse amplitudes.

In [ ]:

waveform_result = exp.check_waveform()

waveform_result = exp.check_waveform()

4. Measure a baseline Rabi oscillation¶

Use the initial Rabi measurement as a reference before you update the pulse amplitude.

In [ ]:

rabi_result = exp.obtain_rabi_params()

rabi_result = exp.obtain_rabi_params()

5. Calibrate the default half-pi pulse¶

Run the half-pi calibration first because many later workflows depend on this pulse.

In [ ]:

hpi_result = exp.calibrate_hpi_pulse(
    targets=exp.qubit_labels,
    n_rotations=1,
)

hpi_result = exp.calibrate_hpi_pulse( targets=exp.qubit_labels, n_rotations=1, )

6. Reload and re-check the Rabi oscillation¶

After updating the control amplitude file, reload and confirm that the Rabi trace reflects the new value.

In [ ]:

# Update `control_amplitude.yaml` manually, then reload
exp.reload()

# Re-check the Rabi oscillation
updated_rabi_result = exp.obtain_rabi_params()

# Update `control_amplitude.yaml` manually, then reload exp.reload() # Re-check the Rabi oscillation updated_rabi_result = exp.obtain_rabi_params()

7. Plot the calibrated pulse¶

Plot the cached half-pi pulse for the target qubit so you can inspect the waveform directly.

In [ ]:

Q0 = exp.qubit_labels[0]

hpi_pulse = exp.hpi_pulse[Q0]
hpi_pulse.plot()

Q0 = exp.qubit_labels[0] hpi_pulse = exp.hpi_pulse[Q0] hpi_pulse.plot()

8. Repeat the calibrated half-pi pulse¶

Use a repeated-sequence check to confirm that the calibrated pulse accumulates as expected.

In [ ]:

repeat_result = exp.repeat_sequence(
    {Q0: hpi_pulse},
    repetitions=20,
)

repeat_result = exp.repeat_sequence( {Q0: hpi_pulse}, repetitions=20, )

9. Optionally save the plot¶

Export the repeated-sequence plot only when you want to keep a record of the result.

In [ ]:

repeat_result.plot(normalize=True, images_dir="./images")

repeat_result.plot(normalize=True, images_dir="./images")